﻿using System;

namespace Patterns.Mediator {
    public static class AbstractExample {

        public static void Run() {
            ConcreteMediator m = new ConcreteMediator();

            ConcreteColleague1 c1 = new ConcreteColleague1(m);
            ConcreteColleague2 c2 = new ConcreteColleague2(m);

            m.Colleague1 = c1;
            m.Colleague2 = c2;

            c1.Send("How are you?");
            c2.Send("Fine, thanks");
        }
    }

    // "Mediator"
    abstract class Mediator {
        public abstract void Send(string message,
          Colleague colleague);
    }

    // "ConcreteMediator"
    class ConcreteMediator : Mediator {
        private ConcreteColleague1 colleague1;
        private ConcreteColleague2 colleague2;

        public ConcreteColleague1 Colleague1 {
            set { colleague1 = value; }
        }

        public ConcreteColleague2 Colleague2 {
            set { colleague2 = value; }
        }

        public override void Send(string message,
          Colleague colleague) {
            if (colleague == colleague1) {
                colleague2.Notify(message);
            } else {
                colleague1.Notify(message);
            }
        }
    }

    // "Colleague"
    abstract class Colleague {
        protected Mediator mediator;

        // Constructor
        public Colleague(Mediator mediator) {
            this.mediator = mediator;
        }
    }

    // "ConcreteColleague1"
    class ConcreteColleague1 : Colleague {
        // Constructor
        public ConcreteColleague1(Mediator mediator)
            : base(mediator) {
        }

        public void Send(string message) {
            mediator.Send(message, this);
        }

        public void Notify(string message) {
            Console.WriteLine("Colleague1 gets message: "
              + message);
        }
    }

    // "ConcreteColleague2"
    class ConcreteColleague2 : Colleague {
        // Constructor
        public ConcreteColleague2(Mediator mediator)
            : base(mediator) {
        }

        public void Send(string message) {
            mediator.Send(message, this);
        }

        public void Notify(string message) {
            Console.WriteLine("Colleague2 gets message: "
              + message);
        }
    }
}
